body {
    font-family: Arial, sans-serif;
    background: #f3f4f6;
    margin: 0;
    padding: 0;
}

.chat-container {
    width: 700px;
    max-width: 90%;
    margin: 50px auto;
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
}

.chat-box {
    height: 450px;
    overflow-y: auto;
    border: 1px solid #ddd;
    padding: 15px;
    margin-bottom: 15px;
    background: #fafafa;
}

.message {
    margin-bottom: 12px;
    padding: 10px;
    border-radius: 8px;
    max-width: 80%;
}

.message.user {
    background: #dbeafe;
    margin-left: auto;
}

.message.agent {
    background: #e5e7eb;
    margin-right: auto;
}

.input-area {
    display: flex;
    gap: 10px;
}

input {
    flex: 1;
    padding: 10px;
    font-size: 16px;
}

button {
    padding: 10px 20px;
    cursor: pointer;
}